hi ,
i use this tool System Cleaner its in Advanced System Optimizer software..it good in deleting cookies & temp files from all user profiles..i m also using it for cleaning those junk stuff 4m my PC..!
works well !! :)

Or you can go to Start > Accessories > System > Disk cleanup. Select the drive you want it clean and after a while a Window pop out. Than you just select what you want to clean and click ok. Software as mention above is also very good for cleaning. Keep those install in your computer for future maintenance of your Window.